阅读说明：本技术 一种显示面板和显示装置 (Display panel and display device ) 是由 魏现鹤 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种显示面板和显示装置。该显示面板包括基板和位于所述基板上的发光单元；基板包括平面区和位于平面区至少一侧的弯折区；在弯折区,发光单元远离基板的一侧包括色彩转换层,色彩转换层用于将第一颜色的光转换为第二颜色的光,其中,第一颜色的光随视角增大时的衰减量小于第二颜色的光随视角增大时的衰减量。弯折区的色彩转换层将第一颜色的光转换为第二颜色的光,可以减少弯折区第一颜色的光的光量,使得不同颜色的光量更加匹配,从而改善弯折区色偏。另外,色彩转换层将第一颜色的光转换为第二颜色的光,减少第一颜色的光的光量的同时增加了第二颜色的光的光量,保证了显示面板的发光亮度。(The invention discloses a display panel and a display device. The display panel comprises a substrate and a light emitting unit positioned on the substrate; the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; in the bending area, one side of the light-emitting unit, which is far away from the substrate, comprises a color conversion layer, wherein the color conversion layer is used for converting light of a first color into light of a second color, and the attenuation amount of the light of the first color along with the increase of the visual angle is smaller than that of the light of the second color along with the increase of the visual angle. The color conversion layer of the bending area converts the light of the first color into the light of the second color, so that the light quantity of the light of the first color of the bending area can be reduced, the light quantities of different colors are more matched, and the color cast of the bending area is improved. In addition, the color conversion layer converts the light of the first color into the light of the second color, the light quantity of the light of the first color is reduced, the light quantity of the light of the second color is increased, and the light emitting brightness of the display panel is ensured.)

1. A display panel includes a substrate and a light emitting unit on the substrate;

the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; in the bending region, one side of the light emitting unit, which is far away from the substrate, comprises a color conversion layer, wherein the color conversion layer is used for converting light of a first color into light of a second color, and the attenuation amount of the light of the first color along with the increase of a viewing angle is smaller than that of the light of the second color along with the increase of the viewing angle.

2. The display panel of claim 1, wherein the color conversion layer comprises at least one quantum dot material.

3. The display panel of claim 2, wherein the quantum dot material comprises a perovskite quantum dot material or a carbon quantum dot material.

4. The display panel according to claim 2, further comprising a light extraction layer and an encapsulation layer;

the light extraction layer is arranged on one side of the light-emitting unit, which is far away from the substrate, and the packaging layer is arranged on one side of the light extraction layer, which is far away from the substrate;

the color conversion layer is disposed between the light extraction layer and the encapsulation layer.

5. The display panel according to claim 2, further comprising a light extraction layer;

the light extraction layer is arranged on one side of the light-emitting unit far away from the substrate, and the color conversion layer is the light extraction layer.

6. The display panel of claim 5 wherein the light extraction layer further comprises scattering particles.

7. The display panel according to claim 2, further comprising an organic encapsulation layer disposed on a side of the light emitting unit away from the substrate, wherein the color conversion layer is the organic encapsulation layer.

8. The display panel according to any one of claims 1 to 7, wherein the light emitting unit includes a first color light emitting unit and a second color light emitting unit;

the aperture ratio of the second color light emitting unit in the bending area is larger than that in the plane area.

9. The display panel according to claim 8, wherein in the bending region, an aperture ratio of the second color light emitting unit gradually increases along a direction in which the planar region points to the bending region.

10. A display device comprising the display panel according to any one of claims 1 to 9.

Technical Field

The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.

Background

In the display panel, the problem that the observation angles of a plane area and a bending area of the display panel are not synchronous under the view field results in different degrees of color cast of display pictures of the plane area and the bending area, so that the bending area has color cast.

Disclosure of Invention

The invention provides a display panel and a display device, which are used for solving the problem of large visual angle color cast of a bending area of the display panel.

In a first aspect, an embodiment of the present invention provides a display panel, including a substrate and a light emitting unit located on the substrate;

the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; in the bending region, one side of the light emitting unit, which is far away from the substrate, comprises a color conversion layer, wherein the color conversion layer is used for converting light of a first color into light of a second color, and the attenuation amount of the light of the first color along with the increase of a viewing angle is smaller than that of the light of the second color along with the increase of the viewing angle.

Optionally, the color conversion layer comprises at least one quantum dot material.

Optionally, the quantum dot material comprises a perovskite quantum dot material or a carbon quantum dot material.

Optionally, the display panel further comprises a light extraction layer and an encapsulation layer;

the light extraction layer is arranged on one side of the light-emitting unit, which is far away from the substrate, and the packaging layer is arranged on one side of the light extraction layer, which is far away from the substrate;

the color conversion layer is disposed between the light extraction layer and the encapsulation layer.

Optionally, the display panel further comprises a light extraction layer;

the light extraction layer is arranged on one side of the light-emitting unit far away from the substrate, and the color conversion layer is the light extraction layer.

Optionally, the light extraction layer further comprises scattering particles.

Optionally, the display panel further includes an organic encapsulation layer, the organic encapsulation layer is disposed on a side of the light emitting unit away from the substrate, and the color conversion layer is the organic encapsulation layer.

Optionally, the light emitting units comprise a first color light emitting unit and a second color light emitting unit;

the aperture ratio of the second color light emitting unit in the bending area is larger than that in the plane area.

Optionally, in the bending region, the aperture ratio of the second color light emitting unit gradually increases along a direction in which the planar region points to the bending region.

In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in any embodiment of the present invention.

According to the technical scheme of the embodiment of the invention, the color conversion layer is arranged on one side of the light-emitting unit of the bending area, which is far away from the substrate, and converts the light of the first color into the light of the second color, so that the light quantity of the light of the first color in the bending area can be reduced, the light quantities of different colors are more matched, and the color cast of the bending area is improved. In addition, the color conversion layer converts the light of the first color into the light of the second color, the light quantity of the light of the first color is reduced, the light quantity of the light of the second color is increased, and the light emitting brightness of the display panel is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The Organic Light-Emitting Diode (OLED) display panel has many advantages of being all solid-state, actively Emitting Light, fast in response speed, high in contrast, capable of achieving flexible display, and the like, and has a wider development space. The current OLED display panel utilizes the advantage of flexibility and bendability, and the bending structure is arranged at the edge of the display panel to form a bending area, so that the narrow frame and comprehensive screen display effect of the OLED display device can be realized.

When the OLED display panel adopts a top emission structure, the top emission structure includes a microcavity, and light generates a microcavity effect in the microcavity, so that light with a specific wavelength is enhanced in a direction perpendicular to the display panel. However, when the viewing angle is increased, under the action of the microcavity effect, the red, green and blue three primary colors have different brightness attenuation trends along with the increase of the viewing angle, so that the display panel generates color shift under a large viewing angle. Because the bending area of the OLED display panel has a certain bending angle relative to the plane area, the plane area and the bending area of the OLED display panel have different visual angle effects under the same visual angle, so that the brightness attenuation degrees of different colors of the plane area and the bending area are inconsistent, and the color cast degrees of the plane area and the bending area are different. For example, in a normal viewing angle, the planar area corresponds to a viewing angle effect in the normal viewing angle, and the bending area corresponds to a viewing angle effect in an oblique viewing angle, so that there is color shift in the bending area relative to the planar area, resulting in a poor display effect of the display panel.

In view of the above problems, embodiments of the present invention provide a display panel. Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 1, the display panel includes a substrate 110 and a light emitting unit 120 on the substrate; the substrate 110 includes a planar area 111 and a bending area 112 located at least one side of the planar area 111. In the bending region 112, a side of the light emitting unit 120 away from the substrate 110 includes a color conversion layer 130, and the color conversion layer 130 is used for converting light of a first color into light of a second color, wherein an attenuation amount of the light of the first color with an increase of a viewing angle is smaller than an attenuation amount of the light of the second color with an increase of the viewing angle.

Specifically, the bending region 112 may be located at an edge of the display panel, for example, the bending region 112 may be located at left and right edges of the display panel. The color conversion layer 130 converts the light of the first color into the light of the second color, and can reduce the light quantity of the light of the first color in the bending region 112, so that the light quantities of different colors are more matched, thereby improving the color shift of the bending region. In addition, the color conversion layer 130 converts the light of the first color into the light of the second color, which increases the light amount of the light of the second color while reducing the light amount of the light of the first color, ensuring that the display panel has a larger light emission luminance.

The light of the first color may be monochromatic light or mixed light. The light of the second color may be monochromatic light or mixed light. The monochromatic light is light of three primary colors, including blue light, green light and red light. The mixed color light is light of any color and formed by mixing light of three primary colors, for example, the mixed color light may include cyan light and orange light, wherein the cyan light may be formed by mixing blue light and green light, and the orange light may be formed by mixing green light and red light. For example, when the bending region 112 is blue, the light of the first color may be monochromatic blue light, and the light of the second color may be monochromatic red light or monochromatic green light. At the bending region 112, the color conversion layer 130 converts the blue light into red or green light, thereby reducing the amount of blue light of the bending region 112, and thus improving the bluing of the bending region 112. Alternatively, the light of the second color may be a mixed light, for example may be orange light. The color conversion layer 130 can convert monochromatic blue light into orange light, and can also reduce the amount of blue light in the bending region 112, thereby improving the bluish bending region 112.

In addition, when the bending region 112 is cyan, the light of the first color is cyan light formed by mixing blue light and green light, and the light of the second color may be red light. In the inflection region 112, the color conversion layer 130 converts cyan light into red light, and the amount of cyan light in the inflection region 112 can be reduced, so that the cyan bias of the inflection region 112 can be improved. It should be noted that the color shift of the display panel to blue or cyan is merely an example, and is not limited. In other embodiments, the color shift of the display panel may also be a color shift of another color, and the colors of the corresponding first color light and second color light may also be adaptively adjusted. In addition, the amount of light that the color conversion layer converts the light of the first color into the light of the second color may be adjusted according to the degree of color shift.

According to the technical scheme, the color conversion layer is arranged on one side, far away from the substrate, of the light emitting unit in the bending area, the color conversion layer converts light of the first color into light of the second color, the light quantity of the light of the first color in the bending area can be reduced, the light quantities of different colors are matched, and therefore color cast of the bending area is improved. In addition, the color conversion layer converts the light of the first color into the light of the second color, the light quantity of the light of the first color is reduced, the light quantity of the light of the second color is increased, and the display panel is ensured to have larger light emitting brightness.

Optionally, the color conversion layer comprises at least one quantum dot material.

In particular, quantum dot materials have the property of converting short wavelength light into long wavelength light. The quantum dot material has an absorption peak wavelength range and a luminescence peak wavelength range, and can convert color light corresponding to the absorption peak wavelength range into color light corresponding to the luminescence peak wavelength range. Conversion of light of different colors can thus be achieved by selecting different quantum dot materials. A quantum dot material may correspond to a range of absorption peak wavelengths.

When the light of the first color and the light of the second color are both monochromatic light, the color conversion layer may include a quantum dot material having an absorption peak wavelength range corresponding to a wavelength range of the light of the first color and a light emission peak wavelength range corresponding to a wavelength range of the light of the second color. Illustratively, when the light of the first color is blue light and the light of the second color is red light, the color conversion layer comprises a quantum dot material having an absorption peak wavelength range that is a wavelength range of the blue light and an emission peak wavelength range that is a wavelength range of the red light, thereby achieving conversion of the blue light into the red light.

When the light of the first color or the light of the second color is mixed color light, the color conversion layer may include a plurality of quantum dot materials. For example, when the light of the first color is cyan light and the light of the second color is red light, the color conversion layer may include two kinds of quantum dot materials, wherein one kind of quantum dot material has an absorption peak wavelength range of blue light and an emission peak wavelength range of red light, and may convert the blue light into red light. The absorption peak wavelength range of another quantum dot material is the wavelength range of green light, and the emission peak wavelength range is the wavelength range of red light, so that the green light can be converted into the red light. Thereby it is achieved that cyan light of the first color is converted into red light of the second color. Furthermore, when the light of the first color is blue light and the light of the second color is orange light, the color conversion layer may also include two kinds of quantum dot materials, wherein one kind of quantum dot material has an absorption peak wavelength range of the blue light and an emission peak wavelength range of the red light, and may convert the blue light into the red light. The other quantum dot material has an absorption peak wavelength range of blue and a light emission peak wavelength range of green, and can convert the blue light into the green light. Thereby it is achieved that the blue light of the first color is converted into orange light of the second color.

It should be noted that the kind of the quantum dot material included in the color conversion layer is merely an example, and is not limited. In other embodiments, the color conversion layer may include a greater variety of quantum dot materials. Also, the amount of light that the color conversion layer converts the light of the first color into the light of the second color may be adjusted by adjusting the doping ratio of the quantum dot material in the color conversion layer.

Illustratively, the quantum dot material may comprise a perovskite quantum dot material or a carbon quantum dot material. The perovskite quantum dot material or the carbon quantum dot material can respectively carry out conversion among light with various colors, and when the color conversion layer comprises the perovskite quantum dot material or the carbon quantum dot material, the color conversion layer can realize conversion of various colors, so that the color cast requirements of various colors of the display panel are better met. For example, the perovskite quantum dot material includes green perovskite quantum dots, which may convert blue light to green light. Thus, a color conversion layer formed of quantum dots of at least one color may enable conversion of light of a first color to light of a second color.

On the basis of the above technical solution, fig. 2 is a schematic structural diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 2, the display panel further includes a light extraction layer 140 and an encapsulation layer 150; the light extraction layer 140 is disposed on a side of the light emitting unit 120 away from the substrate 110, and the encapsulation layer 150 is disposed on a side of the light extraction layer 140 away from the substrate 110; the color conversion layer 130 is disposed between the light extraction layer 140 and the encapsulation layer 150.

Specifically, as shown in fig. 2, the color conversion layer 130 may be disposed on a surface of the light extraction layer 140 away from the light emitting unit 120. The light extraction layer 140 has the effects of narrowing, selecting, reinforcing and the like on the light emitted from the light emitting unit 120, and by disposing the color conversion layer 130 between the light extraction layer 140 and the encapsulation layer 150, since the encapsulation layer 150 has a larger thickness, the encapsulation layer 15 can compensate the thickness difference between the bending region 112 formed by disposing the color conversion layer 130 on the bending region 112 and the plane region 111, thereby ensuring the flatness of the display panel.

It should be noted that fig. 2 exemplarily shows that the color conversion layer is a film layer formed by quantum dot material alone, and is disposed on a side of the light emitting unit 120 away from the substrate 110. In other embodiments, the quantum dot material may be doped into existing film layers in the display panel to form a color conversion layer.

Exemplarily, fig. 3 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 3, the display panel includes a light extraction layer 140; the light extraction layer 140 is disposed on a side of the light emitting unit 120 away from the substrate 110, and the color conversion layer is the light extraction layer 140.

Specifically, the light extraction layer 140 may have a color conversion effect by doping a quantum dot material in the light extraction layer 140. By doping the quantum dot material in the light extraction layer 140, a color conversion layer does not need to be arranged independently, so that the process step of independently forming the color conversion layer can be omitted, the display panel is ensured to have smaller thickness, the development trend of lightness and thinness of the display panel is met, the film structure of the display panel does not need to be changed, and the difficulty of the manufacturing process is reduced. In addition, the light extraction layer 140 doped with the quantum dot material may be formed through a process of inkjet printing.

With continued reference to fig. 3, the light extraction layer 140 also includes scattering particles 141.

Specifically, the scattering particles 141 may be included in each of the light extraction layers 140 corresponding to the planar region 111 and the bent region 112. The scattering particles 141 have a scattering effect. When the light is emitted to the scattering particles 141, the light is scattered on the scattering particles 141, so that the light emitted from the display panel is more dispersed, thereby increasing the light quantity at a large viewing angle, and reducing the light quantity emitted from the vertical substrate 110, thereby reducing the light attenuation at the large viewing angle, further reducing the brightness difference of the light with different colors at the large viewing angle, and improving the color cast of the display panel at the large viewing angle.

Fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention. As shown in fig. 4, the display panel includes an organic encapsulation layer 152, the organic encapsulation layer 152 is disposed on a side of the light emitting unit 120 away from the substrate 110, and the color conversion layer is the organic encapsulation layer 152.

In particular, the display panel may further include an encapsulation layer 150. The encapsulation layer 150 generally includes a first inorganic layer encapsulation layer 151, an organic encapsulation layer 152, and a second inorganic encapsulation layer 153, which are disposed in a stack. The organic encapsulation layer 152 may have a color conversion effect by doping quantum dot materials in the organic encapsulation layer 152. Similarly, the quantum dot material is doped in the organic encapsulation layer 152, so that the process step of independently setting the color conversion layer can be saved, the display panel is ensured to have smaller thickness, the development trend of lightness and thinness of the display panel is met, the film structure of the display panel does not need to be changed, and the difficulty of the manufacturing process is reduced.

Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention. As shown in fig. 5, the light emitting unit 120 includes a first color light emitting unit 121 and a second color light emitting unit 122; the aperture ratio of the second color light emitting unit 122 in the bending region 112 is greater than that in the planar region 111.

Specifically, the first color light emitting unit 121 may emit light of a first color, and the second color light emitting unit 122 may emit light of a second color. When the light of the first color is monochromatic light, the first color light emitting unit 121 may be one light emitting unit. When the light of the first color is mixed light, the first color light emitting unit 121 may include light emitting units of at least two different light emitting colors, and similarly, the second color light emitting unit 122 may include a light emitting unit of at least one light emitting color. When the second color light emitting unit 122 includes at least two light emitting units emitting light of different colors, the aperture ratio of each light emitting unit in the bending region may be set to be greater than the aperture ratio in the planar region 111.

By setting the aperture ratio of the second color light emitting unit 122 in the bending area 112 to be greater than the aperture ratio in the planar area 111, the light quantity of the second color light of the bending area 112 is increased, and on the basis that the color conversion layer converts the first color light into the second color light, the light quantity of the second color light emitted by the second color light emitting unit 122 in the bending area 112 is further increased, so that the color cast of the bending area 112 is better improved.

On the basis of the above technical solution, in the bending region 112, along the direction X in which the planar region 111 points to the bending region 112, the aperture ratio of the second color light emitting unit 122 gradually increases.

Specifically, the bending degree of the bending region 112 is greater and greater along the direction X in which the planar region 111 points to the bending region 112. At a predetermined viewing angle, as the bending degree of the bending region 112 increases, the difference between the color shift degree of the bending region 112 and the color shift degree of the plane region 111 becomes larger. Therefore, by providing the aperture ratio of the second color light emitting unit 122 to be gradually increased, the light amount of the second color light can be increased as the degree of curvature of the bending region 112 is increased, so that the color shift of the bending region 112 can be better improved.

Illustratively, the aperture ratio of the light emitting unit 122 of the second color may be increased in a gradient manner, which not only can achieve better matching of the light quantity of the light of the second color with the color shift of the inflection region 112, but also can reduce the difficulty of the process for achieving the increase of the aperture ratio of the light emitting unit 122 of the second color.

In addition, when the second color light emitting unit 122 includes at least two light emitting units emitting light of different colors, the aperture ratio of each of the at least two light emitting units emitting light of different colors in the bending region 112 may be gradually increased along the direction X from the planar region 111 to the bending region 112.

The embodiment of the invention also provides a display device. Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device 70 includes a display panel 71 according to any of the embodiments of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.